linux-kernel - [PATCH v9 9/9] ARM: dts: aspeed: system1: Disable gpio pull down

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Message-ID: <20250204194115.3899174-10-ninad@linux.ibm.com>
Date: Tue,  4 Feb 2025 13:41:12 -0600
From: Ninad Palsule <ninad@...ux.ibm.com>
To: brgl@...ev.pl, linus.walleij@...aro.org, minyard@....org, robh@...nel.org,
        krzk+dt@...nel.org, conor+dt@...nel.org,
        openipmi-developer@...ts.sourceforge.net, joel@....id.au,
        andrew@...econstruct.com.au, devicetree@...r.kernel.org,
        eajames@...ux.ibm.com, linux-arm-kernel@...ts.infradead.org,
        linux-aspeed@...ts.ozlabs.org, linux-kernel@...r.kernel.org,
        linux-gpio@...r.kernel.org
Cc: Ninad Palsule <ninad@...ux.ibm.com>, andrew@...n.ch
Subject: [PATCH v9 9/9] ARM: dts: aspeed: system1: Disable gpio pull down

Disable internal pull down for the following GPIO lines.
- GPIOL4 - Reset PCH registers in the rtc.
- GPIOL5 - Reset portition of Intel ME
- GPIOL6 - FM smi active
- GPIOL7 - psu all dc power good.

Reviewed-by: Eddie James <eajames@...ux.ibm.com>
Signed-off-by: Ninad Palsule <ninad@...ux.ibm.com>
---
 .../dts/aspeed/aspeed-bmc-ibm-system1.dts     | 28 +++++++++++++++++++
 1 file changed, 28 insertions(+)

diff --git a/arch/arm/boot/dts/aspeed/aspeed-bmc-ibm-system1.dts b/arch/arm/boot/dts/aspeed/aspeed-bmc-ibm-system1.dts
index 00b091bc7da9..c8267c97a44e 100644
--- a/arch/arm/boot/dts/aspeed/aspeed-bmc-ibm-system1.dts
+++ b/arch/arm/boot/dts/aspeed/aspeed-bmc-ibm-system1.dts
@@ -355,7 +355,35 @@ &uhci {
 	status = "okay";
 };
 
+&pinctrl {
+	pinctrl_gpiol4_unbiased: gpiol4 {
+		pins = "C15";
+		bias-disable;
+	};
+
+	pinctrl_gpiol5_unbiased: gpiol5 {
+		pins = "F15";
+		bias-disable;
+	};
+
+	pinctrl_gpiol6_unbiased: gpiol6 {
+		pins = "B14";
+		bias-disable;
+	};
+
+	pinctrl_gpiol7_unbiased: gpiol7 {
+		pins = "C14";
+		bias-disable;
+	};
+};
+
 &gpio0 {
+	pinctrl-names = "default";
+	pinctrl-0 = <&pinctrl_gpiol4_unbiased
+		&pinctrl_gpiol5_unbiased
+		&pinctrl_gpiol6_unbiased
+		&pinctrl_gpiol7_unbiased>;
+
 	gpio-line-names =
 	/*A0-A7*/	"","","","","","","","",
 	/*B0-B7*/	"","","","","bmc-tpm-reset","","","",
-- 
2.43.0